Cross-platform MDI-like application in Xojo

Hi all,
in my application i have a side bar and a bottom bar and a lot of windows(~50 window), the side bar is used to navigate between windows.
the problem that i want the side bar and the bottom bar to be fixed at their place when navigating between windows + i want the child window to appear inside the parent window (resize and move with the parent window) , what is the Xojo way of doing it?
Thank you

There is not way of doing true MDI windows on a Mac at all. It has never really been a thing on Mac. The Mac windowing system does not support real windows being bound inside a parent window. Applications like Photoshop simulate this using their own “window” system.

Typically an application like that on Mac would use floating palets for the navigation and side bars.

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You could possibly achieve this by converting all of your windows to container controls and embed the relevant container control into the window containing the side bar and bottom bar.

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@Ian_Kennedy , @kevin_g
Thank your for you replies , your help is much appreciated!